On the day after the study intervention period is completed each infant will be assessed by an investigator unaware of the infant's study group assignment. The assessment will include (1) a 3-minute measurement of sucking strength and coordination using "NeoSuck RT", and (2) two observational checklists (NOMAS and EFS) used to score infant feeding behaviors. The amount of oral feeding as a percentage of daily feeding volume will be recorded, as well as the number of feeding-associated apnea/bradycardia/oxygen desaturation events in the preceding 24 hours.